Tiger Server Roars, Too: "Tiger Server plays well with Windows clients for other reasons. Apple has also included full support for ACLs (access control lists)?based on the same ACL specification used by Microsoft in Windows XP and Windows 2003. Windows users accessing files or applications on Tiger Server would see the same permissions they would have on any Windows server. And since Apple doesn't charge for CALs (client access licenses), an Apple box running Tiger Server could do the same job as a Windows 2003 system for hundreds or thousands of dollars less."